Drive thru machine NEVER works

We drive thru and order, after we just ordered the kiddies meal the cashier asks us if we paying with cash or card(which is unusual), we say card then she says we will have to pay inside the shop. We ask to place the order with her and pay inside since there was no board notifying us that the card machine is nt working. She says that can't happen, thou I have seen it happen before with 2 ladies who saw the board and decided 2 place their order via the drive thru and pay inside. She calls the manager who instructs her to check if the board is there. The cashier then runs and puts the sign up then claim that it was put there about 20minutes before we drove-thru. I found this so unbelievable as they are undermining their customers and are actually saying they don't need our business. We decided to go get food from an outlet that will give better service. I will never buy there anymore, atleast nt until the manager goes for training.